Malicious PDF — malware analysis report

Static analysis result for SHA-256 646dc1642bd723ed…

MALICIOUS

PDF

71.4 KB Created: 2020-12-30 12:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 41a95be1de4d79637fd3fceb1cfd923a SHA-1: eea505c8a2315bd0e6a911f90d42062a208d01dd SHA-256: 646dc1642bd723ede46e61c1f0032ef0c2d9b439b6b3bd8cc3b3f7ff5633a322
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a link farm designed to direct users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to lead the user to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?utm_term=argentina+football+player+dies In PDF document text
    • https://cdn.sqhk.co/desiruzag/fibZt36/4719243841.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/HH2ihjh/lumujefep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5fddf2e1678fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484994/normal_5fd6370aa8625.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/xegizanovozaluk.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/gj8CGin/mr_bullet_feeder_parts.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/rosim.pdfIn PDF document text
    • https://cdn.sqhk.co/rawegili/0gcgfgg/alien_swarm_like_games.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/5585491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5f948a4cbcc08.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/2Hhdgf9/ludexagogeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae743e08-b049-4e06-8a5d-c0ad7ce9adad/7257077496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0192b8-4a03-4f21-94da-eb53f1758e4d/wie_man_zuckerfreie_marshmallows_her.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 5440 bytes
SHA-256: 231f0757796afedf7932387f6b98166c03ad762466d1819abffd692e0da2a2e6
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10556 bytes
SHA-256: 68ec05ca0f06056334756afb360d20e8f457dcc4fd31ded46f1610643d92fb63

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